Networks, firewalls and Zero Trust
What your network exposes to the internet, and how firewalls, segmentation, VPN, ZTNA and Zero Trust protect it: plain explanations and an action plan.
Presented byBelinda
9 min readUpdated on 2 October 2026What you will learn
- What a business network is, and why its perimeter has dissolved
- Why exposed Remote Desktop, VPNs and admin interfaces attract attackers
- How firewalls and segmentation limit the damage
- The difference between VPN and ZTNA, and what Zero Trust really changes
- The Wi-Fi and DNS good practices recommended by ANSSI, the French national cybersecurity agency
- An eight-step action plan suited to a small or mid-sized business
Free chapter with your account
Chapter 1 is free to read. Chapters 2 to 21, like the Junior, Senior and Expert levels of the Cyber Quiz, are free too: all you need is a free KrakenShield account with a confirmed email address.
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